ResolveIpNetEntry2 function (netioapi.h)

The ResolveIpNetEntry2 function resolves the physical address for a neighbor IP address entry on the local computer.

Syntax

IPHLPAPI_DLL_LINKAGE _NETIOAPI_SUCCESS_ NETIOAPI_API ResolveIpNetEntry2(
  PMIB_IPNET_ROW2     Row,
  const SOCKADDR_INET *SourceAddress
);

Parameters

Row

A pointer to a MIB_IPNET_ROW2 structure entry for a neighbor IP address entry. On successful return, this structure will be updated with the properties for neighbor IP address.

SourceAddress

A pointer to a an optional source IP address used to select the interface to send the requests on for the neighbor IP address entry.

Return value

If the function succeeds, the return value is NO_ERROR.

If the function fails, the return value is one of the following error codes.

Return code Description
ERROR_BAD_NET_NAME
The network name cannot be found. This error is returned if the network with the neighbor IP address is unreachable.
ERROR_INVALID_PARAMETER
An invalid parameter was passed to the function. This error is returned if a NULL pointer is passed in the Row parameter, the Address member of the MIB_IPNET_ROW2 pointed to by the Row parameter was not set to a valid IPv4 or IPv6 address, or both the InterfaceLuid or InterfaceIndex members of the MIB_IPNET_ROW2 pointed to by the Row parameter were unspecified. This error is also returned if a loopback address was passed in the Address member.
ERROR_NOT_FOUND
The specified interface could not be found. This error is returned if the network interface specified by the InterfaceLuid or InterfaceIndex member of the MIB_IPNET_ROW2 pointed to by the Row parameter could not be found.
ERROR_NOT_SUPPORTED
The request is not supported. This error is returned if no IPv4 stack is on the local computer and an IPv4 address was specified in the Address member of the MIB_IPNET_ROW2 pointed to by the Row parameter or no IPv6 stack is on the local computer and an IPv6 address was specified in the Address member.
Other
Use FormatMessage to obtain the message string for the returned error.

Remarks

The ResolveIpNetEntry2 function is defined on Windows Vista and later.

The ResolveIpNetEntry2 function is used to resolve the physical address for a neighbor IP address entry on a local computer. This function flushes any existing neighbor entry that matches the IP address on the interface and then resolves the physical address (MAC) address by sending ARP requests for an IPv4 address or neighbor solicitation requests for an IPv6 address. If the SourceAddress parameter is specified, the ResolveIpNetEntry2 function will select the interface with this source IP address to send the requests on. If the SourceAddress parameter is not specified (NULL was passed in this parameter), the ResolveIpNetEntry2 function will automatically select the best interface to send the requests on.

The Address member in the MIB_IPNET_ROW2 structure pointed to by the Row parameter must be initialized to a valid IPv4 or IPv6 address and family. In addition, at least one of the following members in the MIB_IPNET_ROW2 structure pointed to the Row parameter must be initialized to the interface: the InterfaceLuid or InterfaceIndex.

The fields are used in the order listed above. So if the InterfaceLuid is specified, then this member is used to determine the interface on which to add the unicast IP address. If no value was set for the InterfaceLuid member (the values of this member was set to zero), then the InterfaceIndex member is next used to determine the interface.

If the IP address passed in the Address member of the MIB_IPNET_ROW2 pointed to by the Row parameter is a duplicate of an existing neighbor IP address on the interface, the ResolveIpNetEntry2 function will flush the existing entry before resolving the IP address.

On output when the call is successful, ResolveIpNetEntry2 retrieves the other properties for the neighbor IP address and fills out the MIB_IPNET_ROW2 structure pointed to by the Row parameter. The PhysicalAddress and PhysicalAddressLength members in the MIB_IPNET_ROW2 structure pointed to by the Row parameter will be initialized to a valid physical address.

Requirements

   
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header netioapi.h (include Iphlpapi.h)
Library Iphlpapi.lib
DLL Iphlpapi.dll

See also

CreateIpNetEntry2

DeleteIpNetEntry2

FlushIpNetTable2

GetIpNetEntry2

GetIpNetTable2

MIB_IPNET_ROW2

MIB_IPNET_TABLE2

SOCKADDR_INET

SetIpNetEntry2